/*!
 * jquery.base64.js 0.1 - https://github.com/yckart/jquery.base64.js
 * Makes Base64 en & -decoding simpler as it is.
 *
 * Based upon: https://gist.github.com/Yaffle/1284012
 *
 * Copyright (c) 2012 Yannick Albert (http://yckart.com)
 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php).
 * 2013/02/10
 **/
;
(function($) {
	var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", a256 = '', r64 = [ 256 ], r256 = [ 256 ], i = 0;
	var UTF8 = {
		/**
		 * Encode multi-byte Unicode string into utf-8 multiple single-byte characters
		 * (BMP / basic multilingual plane only)
		 *
		 * Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
		 *
		 * @param {String} strUni Unicode string to be encoded as UTF-8
		 * @returns {String} encoded string
		 */
		encode : function(strUni) {
			// use regular expressions & String.replace callback function for better efficiency
			// than procedural approaches
			var strUtf = strUni.replace(/[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
			function(c) {
				var cc = c.charCodeAt(0);
				return String.fromCharCode(0xc0 | cc >> 6, 0x80 | cc & 0x3f);
			}).replace(
					/[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
					function(c) {
						var cc = c.charCodeAt(0);
						return String.fromCharCode(0xe0 | cc >> 12,
								0x80 | cc >> 6 & 0x3F, 0x80 | cc & 0x3f);
					});
			return strUtf;
		},

		/**
		 * Decode utf-8 encoded string back into multi-byte Unicode characters
		 *
		 * @param {String} strUtf UTF-8 string to be decoded back to Unicode
		 * @returns {String} decoded string
		 */
		decode : function(strUtf) {
			// note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
			var strUni = strUtf.replace(
					/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars
					function(c) { // (note parentheses for precence)
						var cc = ((c.charCodeAt(0) & 0x0f) << 12)
								| ((c.charCodeAt(1) & 0x3f) << 6)
								| (c.charCodeAt(2) & 0x3f);
						return String.fromCharCode(cc);
					}).replace(
					/[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars
					function(c) { // (note parentheses for precence)
						var cc = (c.charCodeAt(0) & 0x1f) << 6
								| c.charCodeAt(1) & 0x3f;
						return String.fromCharCode(cc);
					});
			return strUni;
		}
	};

	while (i < 256) {
		var c = String.fromCharCode(i);
		a256 += c;
		r256[i] = i;
		r64[i] = b64.indexOf(c);
		++i;
	}

	function code(s, discard, alpha, beta, w1, w2) {
		s = String(s);
		var buffer = 0, i = 0, length = s.length, result = '', bitsInBuffer = 0;

		while (i < length) {
			var c = s.charCodeAt(i);
			c = c < 256 ? alpha[c] : -1;

			buffer = (buffer << w1) + c;
			bitsInBuffer += w1;

			while (bitsInBuffer >= w2) {
				bitsInBuffer -= w2;
				var tmp = buffer >> bitsInBuffer;
				result += beta.charAt(tmp);
				buffer ^= tmp << bitsInBuffer;
			}
			++i;
		}
		if (!discard && bitsInBuffer > 0)
			result += beta.charAt(buffer << (w2 - bitsInBuffer));
		return result;
	}

	var Plugin = $.base64 = function(dir, input, encode) {
		return input ? Plugin[dir](input, encode) : dir ? null : this;
	};

	Plugin.btoa = Plugin.encode = function(plain, utf8encode) {
		plain = Plugin.raw === false || Plugin.utf8encode || utf8encode ? UTF8
				.encode(plain) : plain;
		plain = code(plain, false, r256, b64, 8, 6);
		return plain + '===='.slice((plain.length % 4) || 4);
	};

	Plugin.atob = Plugin.decode = function(coded, utf8decode) {
		coded = String(coded).split('=');
		var i = coded.length;
		do {
			--i;
			coded[i] = code(coded[i], true, r64, a256, 6, 8);
		} while (i > 0);
		coded = coded.join('');
		return Plugin.raw === false || Plugin.utf8decode || utf8decode ? UTF8
				.decode(coded) : coded;
	};
}(jQuery));
